Hot-blast stove



V I 2Sheets-Sheet 1. V. 0. STROBEL.

HOT BLAST STOVE.

(No Model.)

Witnesses: O $W Inventor Attorney 2 Sheets-Sheet 2. V. O. STROBEL.

HOT BLAST STOVE.

No. 858,500. Patented Mar, 1, 1887.

Witnesses:

Attorney UNITED STATES VICTOR O. STROBEL, OF PHILADELPHIA, PENNSYLVANIA.

HOT- BLAST STOVE.

SPECIFICATION forming part of Letters Patent No. 358,500, dated March 1, 1887.

Serial No. 202,330. (No model.)

To all whom it may concern-.-

Be it known that I, VICTOR O. STRonEL, of Philadelphia, Philadelphia county, Pennsyl Vania, have invented certain new and useful Improvements in Hot-Blast Stoves, of which the following is a specification.

This invention pertains to regenerative hotblast stoves for heating the blast employed in blast-furnaces, &c., and the improvements will be readily understood from the following description, taken in connection with the accompanying drawings, in which-- Figure l is a vertical section of a singlepass regenerative stove, illustrating one feature of my improvements; Fig. 2, a horizontal section of the same,- Fig. 3, a vertical sec tion of a pair of stoves illustrating my improvements, the left-hand stove of the pair being shown as a two-pass stove with its chimney-connection at the top, while the righthand stove of the pair is shown as a threepass stove with its chimney-connection at the bottom; Fig. 4, a.plan of the same; Fig. 5, a vertical section and elevation of a group of three stoves illustrating my improvements, the stove being shown as of the single-pass type with chimneyconnection at the tops;

Fig. 6, a horizontal section of the same; Fig.-

7, a side elevation of the same, and Fig. 8 a plan of the same.

Regenerative hot-blast stoves are sometimes arranged with a single pass --that is, the heating gases or blast being heated enter at one end of the stove and move directly toward and out at the other end of the stoveand sometimes, again, with several passes, up and down which the heating gases or blast being heated pass alternately from the inlet to the outlet, and the chimney-connection and the blast and gas connection are sometimes arranged at the bottom of the stove and some times at the top.

My improvements are applicable to stoves constructed in any of these ways.

In the drawings, A represents a hot-blast stove containing regenerative brickwork to be heated by the passage through it'of burning gases, and to give up heat to blast passing through it; B, the chimney-connection of the stove, this connection being shown as at the top of the stove,- except in the case of the right-hand end stove of Fig. 3, where the chimney-connection is at the bottom, the chimhey-connection being provided, as usual, with a valve by which the communication between stove and chimney may be cut off; 0, the coldblast inlet, provided with the usual valves, by which the cold blast enters the stove, such inlet being located, as usual, near the chimneyconnection, whether at the top or bottom of the stove; D, the hot-blast outlet, provided with the usual valves, by which the blast after passing through the stove and becoming heated leaves the stove, such hot-blast connection being located at the point in the stove most distant from the cold-blast inlet; E, a combustion chamber, consisting of a structure separated from the stove but connected therewith at a point most distant from the chimney-connection of the stove; F, the gas-inlet to the combustion-chamber, such inlet communicating through a valve with a gas-main,

and provided, if desired, with a gaseburner for securing a proper diffusion of the gas and air of combustion admitted with it, it being essential that air for combustion should be admitted to the combustion-chamber to unite with the gas; and G, a valve serving to close or open the connection between the combustion-chamber and the stove, there being one of these valves for each of the stoves with which the combustion'chamber is connected.

The gas'burner F referred to may, with excellent satisfaction, be of the kind shown in United States Letters Patent N o. 244, 746.

In Fig. 1 there is but a single stove, and this stove is provided with a combustion-chamber separated from but connected with the stove structure. The stove has its chimneyconnection at thetop, and the burning gases are admitted at the bottom. The gas and air of combustion are admitted at the base of the combustion-chamber, which is a low cylindrical structure, and in order to give volume to the combustionchamber and length to the path of the gases before they reach the stove the combustion-ehamber is provided with an upanddown pass by means of a central par tition-wall reaching from the base of the combustion-chamber to near the roof of the same. When the stove is to be heated, the chimneyvalve is to be opened and the hot and cold blast valves closed and the valve G open. Gas and air of combustion enter the combustionchamber and mingle and go into combustion, and rise and turn over the partition-wall and pass to the stove, and thence up the regenerative brick-work and out of the chimney. By the time the heating-gases have entered the stove they have reached a substantially perfeet stage of combustion, and the entire regenerative work of the stove becomes thereby subjected to the action of heatinggases in perfect combustion as distinguished from gases whose combustion is in. a merely progressive state of development. By this means a superior efficiency is given to the stove with a comparatively small amount of regenerative brickwork. The combustion-chamber is lined with refractory material, and when the lining becomes destroyed by use it may be easily repaired without reference to the condition of the brick-work of the stove proper, a suitable man-hole being preferably provided in the combustion-chamber.

When the stove is under blast, the chimneyvalve and the valve between the combustionehamber and stove are closed, and consequently the blast does not enter the combustion-chamber. The combustion chamber is therefore not subjected to those extremes of temperature represented by the gas going into combustion and by the air-blast being heated. As the combustion-chamber need never necessarily be subjected to the blastpressure, it is obvious that it may be of comparatively weak and economical construction.

In the constructions illustrated in Figs. 3 and 4 a single combustion-chamber is made to answer for two stoves. Of the two stoves the one at the left is a two-pass stove, while the one at the right is a three-pass stove, both having the gas-inlets and the hot-blast outlets at the top of the stove. I do not contemplate at present the combination in such an arrangement of two stoves of dissimilar character, but I illustrate the matter. in this manner in order to render clear the applicability of the system to various arrangements of stoves. In this arrangement of Figs. 3 and 4 one of the stoves is under blast, its communication with the combustion-chamber being entirely cut off, while the other stove is under gas, its blastconnection being entirely out oft". In this arrangement the combustion-chamber will always be under gas, the change from one stove to the other being effected by manipulating the various stove-valves. In the arrangement shown in Figs. 3 and 4 volume and length of path in combustion-chamber are secured by the height of combustionchamber incident to the gasinlets of the stove being at their tops.

In Figs. 5, 6, 7, and 8 Ishow a combination of one combustion-chamber with three stoves, the three stoves having the gas-inlets at their bases. In this case, as in the ease of the structure shown in Figs. 1 and 2,volume and length of path in the combustion-chamber are secured by making the combustion-chamber low and large, and forming it with an up-and-down pass. In the present case the double pass is formed in the combustion-chamber by an annular inner wall, the gas and air for combustion entering within this inner wall and turning over its top and passing downward and out through the connection or connections to whichever stove or stoves may be under gas.

In all hot-blast stoves of the regenerative type, as usually constructed, the combustionchamber is arranged within the structure of the stove proper, and becomes subjected to the extremes of heat and cold, represented by the gas in combustion and in the incoming cold air, and the combustion-chamber is also subjected to the full pressure of the blast. structures are obviously radically deficient in the peculiar qualitiesinherent in my improvements. In ordinary pipe-stoves the furnace or combustion-chamber is of course separate from the pipes through which the blast passes in being heated; but'the entire construction and mode of operation of these pipe-stoves are so radically different from the construction and mode of operation involved in regenerative stoves that comparisons need not be made, it being obvious that no part of the gas-path in the pipe-stoves becomes subjected to the pressure of blast or to the two extremes of heat and cold above noted. Regenerative stoves have been constructed in double vertical form,somewhat like an inverted letter U,one limb of the structure forming the combustion-chamber;

the same time peculiarly adapted for economical maintenance. 7

It has been proposed to provide regenerative hot-blast stoves with regenerative chambers for heating the gases preliminary to admitting the gas to the combustion-chamber in which it is burned in the stove. In such devices as proposed the hot-blast stove in which the gases were burned were provided with combustion-chambers in which the gas was to be burned, and with inlets for the gas and air of combustion. The system might be briefly described as a regenerative hot-blast stove for heating the gas before it was passedinto the combustion-chamber of another stove to be burned. My invention is broadly distinguishable from such proposed system, inasmuch as the combustion-chamber employed by me is not a preheater of the gas to be burned, and no other combustion-chamber is employed in the regenerative portion of the stove, and no air of combustion, and consequently no inlet for such air,is necessarily employed in the regenerative work proper. I do not necessarily preheat the gas before admitting it to my combustion-chamber. I take the gas in the Such condition in which it may come, whether it be at usual temperature or previously heated in suitable apparatus, it being no part of the office of my combustion-chamber to elevate the temperature of the gas before ignition.

I claim as my invention 1. A hot-blast stove containing regenerative work, connections thereto for an inflow and outflow of blast, and provided with valves, a chimney-connection thereto provided with a valve, a combustion-chamber exterior to the stove, agas-inlet to the combustion-chamber, a connection leading from the combustionchamber to the stove, and a valve in said lastmentioned connection,combined substantially as and for the purpose set forth.

2. A hot-blast stove containing regenerative work, connections thereto for the inflow and outflow of blast, and provided with valves, a chimney-connection thereto provided with a valve, a combustion'chamber exterior to the stove, a connection leading from theb'ase of the combustion-chamber to the stove, a valve in the last-mentioned connection, a gas-inlet at the base of the combustion-chamber, and a partition-wall rising from the base of the combustion-chamber toward the roof thereof between the gas-inlet and the gas-connection to the purpose set forth.

3. A hot-blast stove containing regenerative work, connections thereto for the inflow and outflow of blast, and provided with valves, a chimney-connection thereto provided with a valve, a combustion-chamber exterior to the stove, a connection leading from the combustion-chamber to the stove, a valve in said lastmentioned connection, a gas-inlet to the combustion-chamber, and a gas-burner disposed exterior to the combustion-chamber at said gas-inlet and connecting with a source of gas and air supply, combined substantially as and for the purpose set forth.

4. Two or more hot-blast stoves containing regenerative work, connections thereto for the inflow and outflow of blast, and provided with valves, chimney-connections thereto provided with valves, a combustion-chamber, a gas-inlet to the combustion-chamber, connections leading from the combustion-chamber to the p vroron o. STROBEL.

\Vit-nesses:

A. H. BRooKER, A. KATZ. 

